What this spread spectrum clock generator is and where it fits
The IMIFS784BZB is a spread spectrum clock generator from the IMIFS family, designed to reduce electromagnetic interference (EMI) by modulating the output clock frequency over a controlled bandwidth. It accepts CMOS or TTL inputs and delivers CMOS or TTL outputs, with a maximum output frequency of 82 MHz. The part integrates a PLL and operates from either a 2.97 V to 3.63 V rail or a 4.5 V to 5.5 V rail, making it compatible with both 3.3 V and 5 V logic systems. It comes in an 8-SOIC surface-mount package and is rated for commercial temperature environments (0°C to 70°C). Typical applications include clock conditioning in consumer electronics, office equipment, and industrial control boards where conducted or radiated EMI must be kept within regulatory limits without adding ferrite beads or shielding cans.
82 MHz maximum frequency — timing margin and spread-spectrum trade-offs
The 82 MHz ceiling sets the upper bound for the output clock. For a 50 MHz base clock, the spread-spectrum modulation will swing the instantaneous frequency within the PLL's modulation profile, so the downstream logic (FPGA, MCU, or ASIC) must tolerate a peak frequency that may exceed the nominal by the spread percentage. If the design already runs near the device's maximum input clock rating, the spread-spectrum excursion could push it over. Budget at least 5% headroom above the nominal clock rate when selecting this part.
Dual supply range — rail compatibility check
The IMIFS784BZB accepts two distinct supply ranges: 2.97 V to 3.63 V (nominally 3.3 V) and 4.5 V to 5.5 V (nominally 5 V). There is no single-range 3.3 V-only or 5 V-only variant — the part is designed to work across both families. On a 3.3 V rail, ensure the regulator holds above 2.97 V under load; on a 5 V rail, stay below 5.5 V. The input and output logic levels track the supply rail, so mixing 3.3 V and 5 V domains on the same part is not supported — all I/O swing to the same VDD level.
RoHS non-compliance — BOM constraint
This part is marked RoHS non-compliant, which means it contains lead (Pb) or other restricted substances above the RoHS threshold. For EU or China RoHS-regulated markets, this part cannot be used in new consumer products. It may still be acceptable for military, aerospace, or industrial equipment with explicit RoHS exemptions, or for repair/service of legacy boards. If your BOM requires RoHS compliance, look for a lead-free suffix variant in the same family.
Active lifecycle — no immediate obsolescence risk
The IMIFS784BZB is listed as Active, meaning the manufacturer continues to produce it and there is no announced end-of-life (EOL) or last-time-buy (LTB) window. For new designs, this part carries no near-term supply discontinuity risk. However, always monitor PCNs (Product Change Notifications) for any future status change.